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Filter for PVC / VINYL Coating – Heated Oven Fume Mist Eliminators - Chemical & Pharmaceuticals - Fine Chemicals
PROCESS INFORMATION: Most common manufacturing applications are Synthetic Leather (car upholstery, bags, shoes etc.), vinyl coated and linoleum flooring, vinyl coated wallpaper, laminated sheets (special films, belts, tarpaulins) and foam products. Polyvinyl-chloride (PVC) is a thermoplastic and is mixed to additives which improve its properties and enable it to be processed more easily
- Most common major additives are:
- plasticizers to provide elasticity i.e. DOP (Dioctyl Phthalate)
- stabilizers to prevent degradation i.e. PB salts
- lubricants (solvents) to prevent plugging on cylinders of the calendering machine
- charges i.e. silicium
- pigments i.e. anthraquinones
Typical formulation : PLASTICIZERS : 50%
SOLVENTS : 48%
OTHERS : 2%
The emulsion (polymer + additives) is spread coated and heat cured or calenderized in ovens. PVC emulsion is fed to ovens with successive steps of curing/calendering and cooling sections. Gas is extracted from curing/calendering sections and cooling sections.
Exit gas from curing ovens (180 – 150 °C) which has been directly or indirectly heated.
Depending upon formulation, 500 to 5,000 mg/m³ of plasticizers are present in the exhaust gas. Solvents and other products are also entrained.
PROBLEMS TO SOLVE
Air pollution.
As an average, industrial sites regulations specify a maximum emission of 20 mg/m³ of plasticisers ( = invisible ), or 50 mg/m³ total carbon, or an odour related limit. More stringent levels, e.g. 2 mg/m3 of DOP plasticiser are now sought.
Recovered plasticizer and solvent could be re-used.
FILTER DESIGN SOLUTIONS / OPTIONSPrefilters
- A washable, reusable ‘Becoil’ Pre-filter in 304Stainless Steel knitted mesh, with support frame
- A washable, reusable ‘Becoil’ Pre-filter in 304Stainless Steel + Glass Fibre co-knitted mesh, with support frame
- A single disposable ‘Becoil’ pad of G35 Glass Fibre, with support frame
Candle Filter Mist Eliminators
- High Efficiency, Brownian Diffusion ‘Becofil’ Candle Filters, hanging type HT or standing type F, with TGW15 or B14W Glass Fibre elements and Carbon Steel structure.
- Xtra-Pure Highest Efficiency, double concentric bed Brownian Diffusion ‘Becofil’ Candle Filters, hanging type HT or standing type F, with TGW15 or B14W Glass Fibre elements and Carbon Steel structure.